n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 2 |
6 | 8 |
7 | 4 |
8 | 20 |
9 | 50 |
10 | 124 |
11 | 234 |
12 | 708 |
13 | 1548 |
14 | 3862 |
15 | 9234 |
16 | 24723 |
17 | 57884 |
18 | 151618 |
19 | 379592 |
20 | 998060 |
21 | 2518128 |
22 | 6681575 |
23 | 17316668 |
24 | 46002619 |
25 | 120672278 |
26 | 322875444 |
27 | 855590998 |
28 | 2294409103 |
29 | 6123605446 |
30 | 16472081266 |
31 | 44156377366 |
[0,0,2,8,4,20,50,124,234,708,1548,3862,9234,24723, 57884,151618,379592,998060,2518128,6681575, 17316668,46002619,120672278,322875444,855590998, 2294409103,6123605446,16472081266,44156377366] |